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ELI5: What does it mean that a magnetic field's flux vanishes through any closed surface?
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I'm reading the Britannica guide to Electricity and Magnetism, and I came across the following quote:
A fundamental property of a magnetic field is that its flux through any closed surface vanishes.
Can someone explain this in simpler terms? A visual explanation would be great as well. Particularly, I don't understand what the volume and surface are.
Also, I posted this same question in StackExchange and none of them could help me understand it. Here's the link to that:
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